Research On Outburst Prevention Technology Based On Grouting Reinforcement And Hydraulic Punching Strong-weak Coupling

Coal and gas outburst is one of the most serious disasters in coal mines.The accumulation and sudden release of elastic energy near the heading end is the main cause of the outburst.The gas internal energy accumulated in the deep part of the coal seam provides energy for coal and gas outburst.Gas pressure and ground stress determine the scale of outburst energy,and the physical and mechanical properties of coal seams determine whether the coal body can resist energy shocks.In view of the above two influence mechanisms,regional pressure relief technology and coal seam reinforcement technology are proposed,which effectively improves the tunneling The anti-outburst effect in the process.In order to solve the problem that the coal seam outburst of Shoushan No.1 Mine is dangerous and difficult to control,this paper proposes the anti-outburst technology of "strong-weak coupling" through-layer grouting reinforcement and hydraulic punching.This technology uses hydraulic punching and enhanced gas drainage to relieve regional pressure,forming a weakened zone,blocking and absorbing the outburst energy transmitted to the tunneling end face,and grouting reinforcement to the coal roadway area to be excavated to form a strengthened zone to resist residual energy.In this paper,three analysis methods: theory,experiment and field are used to study the energy transmission process of strong and weak structures,the mechanical properties and acoustic emission characteristics of samples with different strong and weak structures.he real-time failure process of strong and weak coupling structures,and through The experiment verifies the effectiveness of the strong-weak coupling antioutburst structure.Research on the mechanism of coal and gas outburst,explaining how energy is dissipated during the transfer process between structures,combined with the geological characteristics and production needs of Shoushan No.1 Mine,the FLAC3 D software is used to control the outburst prevention model of Shoushan No.1 Mine with strong and weak coupling.Numerical simulation results show that the peak stress of the two sides of the strong-weak coupling model roadway is reduced by 12.85%,and the maximum displacement is reduced by 42.1%,which proves the effectiveness of the strong-weak coupling model for outburst prevention and provides theoretical support for the construction of the Shoushan No.1 Mine.Study the mechanical properties and acoustic emission characteristics of samples with different strong and weak coupling structures,and the physical property changes,AE characteristics evolution and crack development laws of samples with different strong and weak coupling structures during uniaxial compression are analyzed.The results show that the larger the strength factor of the strong structure,the more strain energy the specimen can store,the greater the self-carrying capacity,and the larger the maximum AE energy value;the smaller the strength factor of the weak structure,the more cracks and more obvious the deformation.The cumulative number of AE events is more.The VIC-3D non-contact full-field strain measurement system was used to fully record the local failure of the strong-weak coupling structure sample and the full-field real-time failure process,and carry out qualitative and quantitative analysis.The results show that the horizontal strain of the strong structure is only 12.9% of that of the weak structure,and the vertical strain is 38.14%.The damage degree of the weak structure is far greater than that of the strong structure.The existence of the weak structure protects the strong structure.The strong-weak coupling anti-outburst industrial experiment of "hydraulic punching gas drainage + through-layer grouting reinforcement" was carried out in Shoushan No.1 Mine.The total length of the test section was 380 m.The evolution of key parameters of the strong-weak coupling anti-outburst technology engineering practice The analysis and establishment of a strong-weak coupling anti-outburst technology on-site effect evaluation system proves that the strong-weak coupling antioutburst technology can eliminate the risk of coal and gas outbursts,increase the speed of coal tunnel excavation,and achieve safe production.